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標題: 鎳鐵薄膜中微波感應電流之研究
Microwave-induced direct current in permalloy thin films
作者: 蕭丞原
Siao, Cheng-Yuan
關鍵字: coplanar waveguide
induced current
出版社: 物理學系所
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摘要: 本論文是研究鎳鐵薄膜(Ni80Fe20)受微波激發之直流電流與外加磁場變化的關係。樣品為共平面波導(coplanar waveguide,CPW),其中的訊號傳輸線(signal path)為厚度100 nm的鎳鐵薄膜,CPW訊號傳輸線的寬度為50 um。測量系統包含一支高頻的探測器(Probe),內有兩個T型偏置器(Bias-Tee),可以分開微波和直流電流訊號的路徑,脈衝調變的微波訊號經過Bias-Tee高頻輸入端進入樣品,其所激發的直流電流由Bias-Tee的直流端經過電流放大器後由鎖相放大器讀取。實驗結果顯示電流會隨磁場發生震盪的現象,樣品和磁場的角度對振幅很敏銳。在微波頻率小於3.2 GHz,增加微波的頻率會有感應電流振盪的位置會往高場移動,大於3.2 GHz感應的電流就有變小的驅勢;微波功率強度越強則零場的直流感應電流變大。
We study the microwave-induced DC currents of a permalloy (Ni80Fe20 ) thin film in magnetic fields. The device structure is mainly a coplanar waveguide (CPW), whose signal path is a 50 um wide, 100 nm thick permalloy thin film The pulse modulated microwave signal is fed into the sample through the high frequency port of bias-tees and the induced DC current is received from DC terminal thereof. The DC current is then amplified by a current preamplifier, and read out by lock-in technique. We found that the oscillation behavior is quite sensitive to the angle between the sample and the magnetic field. When the frequency (f) of the microwave signal increases, the magnetic oscillation of induced DC current is shifted to high field. As f being slightly larger than 3.2 GHz, the induced DC current suddenly decreases an order of the magnitude. We also studied the power dependence of the induced current on the microwave power.
其他識別: U0005-2708201010373200
Appears in Collections:物理學系所



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